scholarly journals Enhanced Abrasion Resistance of Coated Particleboard Pre-Treated with Atmospheric Plasma

2020 ◽  
Vol 71 (2) ◽  
pp. 129-137
Author(s):  
Jure Žigon ◽  
Sebastian Dahle ◽  
Marko Petrič ◽  
Matjaž Pavlič
Keyword(s):  
Cross Sections ◽  
Abrasion Resistance ◽  
Contact Angles ◽  
Attenuated Total Reflection ◽  
Atmospheric Plasma ◽  
Dbd Plasma ◽  
Coating Application ◽  
Applied Coating ◽  
Floating Electrode ◽  
Lower Contact

This study aims to investigate the influence of atmospheric plasma treatment on the abrasion resistance of particleboards, as an example of a wood-based material, coated with a waterborne finish. The treatment of the substrate, prior to coating application, using a floating-electrode dielectric barrier discharge (FE-DBD) plasma, resulted in an enhanced abrasion resistance of the coated particleboards in comparison to the untreated ones during the abrasion test with a duration of 200 revolutions. This finding was related to lower contact angles of water and coating after treatment with plasma and greater hardness of the coating on the treated substrates. The micrographs of the sample cross sections recorded with scanning electron microscope showed differences in the amounts of remained coating on the abraded areas. Investigation with attenuated total reflection Fourier transform infrared spectroscopy revealed that treatment of the substrate with plasma did not affect the chemical composition nor the curing and structure of the later applied coating. Further studies should be performed to determine the resistance properties of such surface systems to other impacts.

scholarly journals Treatment of wood with atmospheric plasma discharge: study of the treatment process, dynamic wettability and interactions with a waterborne coating

Holzforschung ◽  
2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Jure Žigon ◽  
Matjaž Pavlič ◽  
Pierre Kibleur ◽  
Jan Van den Bulcke ◽  
Marko Petrič ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Treatment Process ◽  
Beech Wood ◽  
Treated Wood ◽  
Plasma Discharge ◽  
Contact Angles ◽  
Atmospheric Plasma ◽  
Waterborne Coating ◽  
Spruce Wood ◽  
The Impact

AbstractPlasma treatment is becoming a mature technique for modification of surfaces of various materials, including wood. A better insight in the treatment process and the impact of the plasma on properties of wood bulk are still needed. The study was performed on Norway spruce and common beech wood, as well as their thermally modified variations. The formations of the airborne discharge, as well as mass changes of the treated wood, were monitored. The impact of such treatment on wood-coating interaction was investigated by evaluating the dynamic wettability and penetration into wood. At the wood surface, plasma streamers were observed more intense on denser latewood regions. Wood mass loss was higher with increasing number of passes through the plasma discharge and was lower for thermally modified wood than for unmodified wood. Plasma treatment increased the surface free energy of all wood species and lowered the contact angles of a waterborne coating, these together indicating enhanced wettability after treatment. Finally, the distribution and penetration depth of the coating were studied with X-ray microtomography. It was found that the coating penetrated deeper into beech than into spruce wood. However, the treatment with plasma increased the penetration of the coating only into spruce wood.

Study on Structure and Properties of Polysulfone Membranes Using Ionic Liquid [n-C16mim][BF4] as a New Structure-Controlled Additive

2013 ◽  
Vol 561 ◽  
pp. 125-129 ◽  
Author(s):  
Ying Ying Ding ◽  
Ya Mei Zhao ◽  
Chang Zheng Zheng ◽  
Dong Huai Tu
Keyword(s):  
Ionic Liquid ◽  
Cross Sections ◽  
Retention Rate ◽  
Contact Angles ◽  
Asymmetric Structure ◽  
Polysulfone Membrane ◽  
Force Microscopy ◽  
Wet Phase Inversion ◽  
Surface Morphologies ◽  
Polysulfone Membranes

Introducing ionic liquid [n-C16mim][BF4] as a new structure-controlled additive, Polysulfone (PSf) membranes were prepared by the wet-phase-inversion using [n-C16mim][BF4] into the casting solution (PSf/NMP). The scanning electron microscope and the atomic force microscopy were utilized to visualize the cross-sections of the membranes to gain more better understanding the structure-controlled ability of [n-C16mim][BF4] and surface morphologies of the membrane. The results indicate that the structures of the membranes were typical bilayer asymmetric finger-pores structure. [n-C16mim][BF4] has stronger ability of the pore-forming. Especially, at the 4:76 ratio of [n-C16mim][BF4]/NMP in the polymer solution ,the membrane has the asymmetric structure and good separation properties of the solution flux. The PSf membrane has the 0.45~0.65μm dimpling close to surface layer, and the retention rate and solution flux of the prepared membrane are 95.2% and 137.5 L•h-1•m-2. Meanwhile, [n-C16mim][BF4] partially retained in the prepared Polysulfone membrane reduced the contact angles of Polysulfone membranes, improving the hydrophilic properties of the membranes.

scholarly journals Benefits of Nonthermal Atmospheric Plasma Treatment on Dentin Adhesion

2018 ◽  
Vol 43 (6) ◽  
pp. E288-E299 ◽  
Author(s):  
AP Ayres ◽  
PH Freitas ◽  
J De Munck ◽  
A Vananroye ◽  
C Clasen ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Water Storage ◽  
Contact Angles ◽  
The Other ◽  
Atmospheric Plasma ◽  
Hybrid Layer ◽  
Water Contact ◽  
Dentin Surface

SUMMARY Objectives: This study aimed to evaluate the influence of two nonthermal atmospheric plasma (NTAP) application times and two storage times on the microtensile bond strength (μTBS) to dentin. The influence of NTAP on the mechanical properties of the dentin-resin interface was studied by analyzing nanohardness (NH) and Young's modulus (YM). Water contact angles of pretreated dentin and hydroxyapatite blocks were also measured to assess possible alterations in the surface hydrophilicity upon NTAP. Methods and Materials: Forty-eight human molars were used in a split-tooth design (n=8). Midcoronal exposed dentin was flattened by a 600-grit SiC paper. One-half of each dentin surface received phosphoric acid conditioning, while the other half was covered with a metallic barrier and remained unetched. Afterward, NTAP was applied on the entire dentin surface (etched or not) for 10 or 30 seconds. The control groups did not receive NTAP treatment. Scotchbond Universal (SBU; 3M ESPE) and a resin-based composite were applied to dentin following the manufacturer's instructions. After 24 hours of water storage at 37°C, the specimens were sectioned perpendicular to the interface to obtain approximately six specimens or bonded beams (approximately 0.9 mm2 in cross-sectional area) representing the etch-and-rinse (ER) approach and another six specimens representing the self-etch (SE) approach. Half of the μTBS specimens were immediately loaded until failure, while the other half were first stored in deionized water for two years. Three other bonded teeth were selected from each group (n=3) for NH and YM evaluation. Water contact-angle analysis was conducted using a CAM200 (KSV Nima) goniometer. Droplet images of dentin and hydroxyapatite surfaces with or without 10 or 30 seconds of plasma treatment were captured at different water-deposition times (5 to 55 seconds). Results: Two-way analysis of variance revealed significant differences in μTBS of SBU to dentin after two years of water storage in the SE approach, without differences among treatments. After two years of water aging, the ER control and ER NTAP 10-second groups showed lower μTBS means compared with the ER NTAP 30-second treated group. Nonthermal atmospheric plasma resulted in higher NH and YM for the hybrid layer. The influence of plasma treatment in hydrophilicity was more evident in the hydroxyapatite samples. Dentin hydrophilicity increased slightly after 10 seconds of NTAP, but the difference was higher when the plasma was used for 30 seconds. Conclusions: Dentin NTAP treatment for 30 seconds contributed to higher μTBS after two years of water storage in the ER approach, while no difference was observed among treatments in the SE evaluation. This result might be correlated to the increase in nanohardness and Young's modulus of the hybrid layer and to better adhesive infiltration, since dentin hydrophilicity was also improved. Although some effects were observed using NTAP for 10 seconds, the results suggest that 30 seconds is the most indicated treatment time.

scholarly journals The influence of surface finishing of Paulownia Siebold et Zucc. on the mechanical properties of lacquered surface

2010 ◽  
pp. 7-23
Author(s):  
Milan Jaic ◽  
Jovan Dobic ◽  
Tanja Palija
Keyword(s):  
Mechanical Properties ◽  
Abrasion Resistance ◽  
Scratch Resistance ◽  
Surface Finishing ◽  
Coating Application ◽  
Acrylic Coating ◽  
Acrylic Coatings ◽  
Paulownia Fortunei ◽  
Free Falling ◽  
Paulownia Elongata

This paper presents the research of influence of sanding, staining and the use of polyurethane and acrylic coating on the adhesion, scratch resistance and abrasion resistance of the coating. Objective was to determine the most important mechanical properties of lacquered surfaces, considering the application of Paulownia elongata and Paulownia fortunei, by using different systems of surface finishing. Cross cut method was used for measurement of adhesion. More accurate view of coating adhesion was obtained by measuring the scratch resistance. Abrasion resistance was tested by the method of free falling of abrasive particles. The applied system of sanding had no effect on the examined mechanical properties. Stained samples lacquered with PU coating showed better adhesion to the non-stained samples. Impact of staining on scratch resistance is not established. Stained samples showed greater resistance to abrasion for both wood species. Samples lacquered with PU coating showed the higher values of mechanical properties compared with samples lacquered with UV acrylic coating. Application of PU coating for surface finishing of Paulownia elongata and Paulownia fortunei is more adequate than the application of UV acrylic coatings, from the point of scratch resistance and abrasion resistance.

Improved abrasion resistance of textile fabrics due to polymer coatings

2018 ◽  
Vol 49 (5) ◽  
pp. 572-583
Author(s):  
Martin Wortmann ◽  
Natalie Frese ◽  
Lubos Hes ◽  
Armin Gölzhäuser ◽  
Elmar Moritzer ◽  
...  
Keyword(s):  
Water Vapor ◽  
Abrasion Resistance ◽  
Polymer Coatings ◽  
Contact Angles ◽  
Woven Fabrics ◽  
Vapor Transport ◽  
Water Vapor Transport ◽  
Slight Reduction ◽  
Textile Fabrics ◽  
Technical Textiles

Textile fabrics are often subject to abrasion, starting from exposed parts of garments to a variety of technical textiles. Abrasion protection by usual coatings, however, can significantly decrease the water vapor transport through a fabric which is often not desired, especially in the case of garments. In our paper, we report on an approach to combine increased abrasion resistance with sufficient water vapor transport properties. For this, different polymers (poly(methyl methacrylate), acrylonitrile butadiene styrene, or amorphous polyamides) were coated on cotton and polyester woven fabrics. The results of abrasion tests against sandpaper show significantly increased abrasion resistance. The absolute evaporation resistance, measured by a Permetest testing device, was only slightly increased up to values still acceptable for typical garments. Images of all coatings by helium ion microscopy deliver an explanation for the measuring results. Polymer coatings on the polyester fabric resulted in a slight reduction of the hydrophobicity, while coating the cotton fabric severely increased the contact angles of the originally superhydrophilic material.

Effect of Cold Plasma on the Levels Mineral Blood Components In Vivo

2021 ◽  
Vol 886 ◽  
pp. 177-182
Author(s):  
Ban H. Adil ◽  
A.S. Obaid ◽  
Maysaa R. Naeemah ◽  
Diana N. Hashem ◽  
Sala S. Hamza
Keyword(s):  
Cold Plasma ◽  
Barrier Discharge ◽  
Atmospheric Plasma ◽  
Blood Component ◽  
Blood Components ◽  
Plasma Exposure ◽  
Probe Diameter ◽  
Variable Voltage ◽  
Floating Electrode

This study illustrates effect of cold plasma CAP on the mineral blood components in vivo. the mineral blood component (Ca, Na, Cl, K and Fe) are used. Floating Electrode-Dielectric Barrier Discharge (FE-DBD) system of probe diameter 4cm is used for this purpose, and variable voltage (0-20) kV and variable frequency (0-30) kHz, the output power was ranged from (10 - 70) W. the effect of cold atmospheric plasma on mineral blood is studied with different exposure durations (30,45,60) sec. As the plasma exposure duration increases, the calcium, potassium and iron components in the blood increased, while The sodium and chlorine elements decreased. These results give an indication of the cold plasma receptor to be used to treat many diseases related to mineral blood components.

scholarly journals An intensified atmospheric plasma-based process for the isolation of the chitin biopolymer from waste crustacean biomass

2018 ◽  
Vol 20 (6) ◽  
pp. 1199-1204 ◽  
Author(s):  
M. Borić ◽  
H. Puliyalil ◽  
U. Novak ◽  
B. Likozar
Keyword(s):  
Atmospheric Pressure ◽  
Atmospheric Plasma ◽  
Dbd Plasma ◽  
Shell Waste

Atmospheric-pressure DBD plasma was used as a methodology for intensified protein removal from crustacean shell waste.

The utilization of LTCC-PDMS bonding technology for microfluidic system applications – a simple fluorescent sensor

2016 ◽  
Vol 33 (3) ◽  
pp. 141-148 ◽  
Author(s):  
Karol Malecha
Keyword(s):  
Fluorescent Sensor ◽  
Attenuated Total Reflection ◽  
Fluorescence Measurement ◽  
Dbd Plasma ◽  
Content Type ◽  
Lab On Chip ◽  
Medical Diagnoses ◽  
Fluorescence Measurements ◽  
Bonding Technology ◽  
And Performance

Purpose This paper aims to present a research on utilization of an irreversible bonding between non-transparent low temperature co-fired ceramics (LTCC) and transparent poly(dimethylsiloxane) (PDMS). The research presented in this paper is focused on the technology and performance of the miniature microfluidic module for fluorescence measurement. Design/methodology/approach The chemical combination of both materials is achieved through surface modification using argon-oxygen dielectric barrier discharge (DBD) plasma. According to the performed spectroscopic analyses (X-ray photoelectron spectroscopy, XPS; attenuated total reflection-Fourier infrared spectroscopy, ATR-FTIR) and contact angle measurements, the LTCC and PDMS surfaces are oxidized during the process. The presented microfluidic module was fabricated using LTCC technology. The possibility for the fabrication of LTCC-PDMS microfluidic fluorescent sensor is studied. The performance of the sensor was examined experimentally. Findings As a result of DBD plasma oxidation, the LTCC and PDMS surfaces change in character from hydrophobic to hydrophilic and were permanently bonded. The presented LTCC-PDMS bonding technique was used to fabricate a microfluidic fluorescent sensor. The preliminary measurements of the sensor have proven that it is possible to observe the fluorescence of a liquid sample from a very small volume. Research limitations/implications The presented research is a preliminary work which is focused on the fabrication of the LTCC-PDMS fluorescent sensor. The microfluidic device was positively tested only for ethanolic fluorescein solutions. Therefore, fluorescence measurements should be performed for biological specimen (e.g. DNA). Practical implications The LTCC-PDMS bonding technology combines the advantages of both materials. One the one hand, transparent PDMS with precise, transparent three-dimensional structures can be fabricated using hot embossing, soft lithography or laser ablation. On the other hand, rigid LTCC substrate consisting of microfluidic structures, electric interconnections, heaters and optoelectronic components can be fabricated. The development of the LTCC-PDMS microfluidic modules provides opportunity for the construction of a lab-on-chip, or micro-total analysis systems-type system, for analytical chemistry and fast medical diagnoses. Originality/value This paper shows utilization of the PDMS-LTCC bonding technology for microfluidics. Moreover, the design, fabrication and performance of the PDMS-LTCC fluorescent sensor are presented.

scholarly journals Surface Activation of Polylactic Acid-Based Wood-Plastic Composite by Atmospheric Pressure Plasma Treatment

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4673 ◽  
Author(s):  
Philipp Sauerbier ◽  
Robert Köhler ◽  
Gerrit Renner ◽  
Holger Militz
Keyword(s):  
Plasma Treatment ◽  
Polylactic Acid ◽  
Photoelectron Spectroscopy ◽  
Laser Scanning ◽  
Atmospheric Pressure Plasma ◽  
Contact Angles ◽  
Laser Scanning Microscopy ◽  
Wood Plastic Composite ◽  
Dbd Plasma ◽  
Plastic Composite

Wood-plastic composite (WPC) based on a polylactic acid (PLA) matrix is a promising material since it is biobased, degradable, sustainable, and 3D printable. However, due to its coloring, visible layers after 3D-printing, and small build volumes of these printers, a coating or gluing of parts might be required. This study investigates the influence of a dielectric barrier discharge (DBD) plasma treatment of PLA-based WPC to activate the surface and improve, e.g., coating capabilities. X-ray photoelectron spectroscopy (XPS) measurements showed the oxidation of the surface due to the formation of carbonyl and carboxyl groups. Laser scanning microscopy revealed a surface roughening after the treatment. Contact angles of water and diiodomethane decreased significantly after the plasma treatment and the consecutively calculated surface free energy increased. Finally, two practical adhesion tests revealed an improvement of the applied acrylic dispersion coating’s adhesion to the WPC surface: The assigned cross-cut class improved, and the pull-off strength increased from 1.4 to 2.3 N/mm2.

scholarly journals Fungal chitosan as membranous material modified by atmospheric plasma

2021 ◽  
Vol 10 (1) ◽  
pp. e9210111543
Author(s):  
Weslley de Souza Paiva ◽  
Francisco Ernesto de Souza Neto ◽  
Erika de Souza Paiva ◽  
Anabelle Camarotti de Lima Batista
Keyword(s):  
Molecular Weight ◽  
Contact Angle ◽  
Apparent Molecular Weight ◽  
Physicochemical Characteristics ◽  
Research Field ◽  
Atmospheric Plasma ◽  
Dbd Plasma ◽  
Promising Alternative ◽  
Chitosan Membrane ◽  
Fungal Chitosan

Objective: This study produced a fungal chitosan membrane extracted from Rhizopus stolonifer, as well as its modification using dielectric barrier discharge plasma (DBD), aiming to improve the physicochemical characteristics of the membrane, optimizing its use in the medical research field. Method: The obtained chitosan was physically and chemically characterized (Molecular Weight, Fourier Transform Infrared, X-ray Diffraction), later were produced fungal chitosan membranes and DBD plasma was applied. The membranes were characterized before and after plasma application using the tests contact angle, swelling and atomic force microscopy (medium roughness) analyzes. Results: A fungal chitosan with a yield of 16.73 mg/g, and an apparent molecular weight of 4 kDa was obtained, being considered of low molecular weight and high degree of deacetylation (84%). It was possible to obtain the membrane and after application of DBD plasma, the contact angle dropped from 77.5° to 30.9°, making it more hydrophilic. Conclusion: Thus, the efficiency of the technique for increasing the hydrophilicity of the fungal chitosan membrane without the additive of chemical reagents during the process was confirmed and the membrane formed is a promising alternative can be used in different ways in the medical area.

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